This paper takes Augustine’s Tractate 46 on the Gospel of John as its core text and argues that “the Incarnation” is not merely a doctrinal tenet within his theological system, but constitutes a “central interpretive para-digm” that permeates his historical engagement, theological construction, and exegetical practice. This paradigm can be operationally defined through three interrelated dimensions: divine condescension and accommodation, the sanctification of material media, and the union of Head and body. Within this framework, the paper first reconstructs the historical context of Tractate 46, revealing how Augustine maps the multiple controversies of the North African Church onto the textual figures of the parable—the “hireling” as a response to Donatist purism, the contrast between the Good Shepherd's self-sacrifice and the hireling's flight as a counter to Pelagian depreciation of grace, the “wolf” as the spiritual adversary threatening the flock, and the “doorkeeper” as an occasion for safeguarding Trinitarian orthodoxy. Second-ly, it analyzes how Augustine, centering on the Incarnation, organically inte-grates the doctrines of election, Christology, Trinitarian theology, and eccle-siology into a coherent theological whole. Finally, it explores how his exe-getical method—including his Christological reconfiguration of the patristic tradition, his use of an “incarnational rhetoric,” the principle of pastoral ac-commodation, and his semiotic theory—translates this paradigm into con-crete interpretive practice, while establishing clear boundaries for polyse-mous interpretation through the rule of faith and the principle of charity. The findings demonstrate that viewing the Incarnation as an interpretive para-digm effectively bridges the gap between historical criticism and theological logic prevalent in current scholarship on the Tractates, revealing Augustine’s dynamic methodology that integrates apologetics, exegesis, and pastoral care, and illuminating the inner unity and theological depth of his thought.